Comment by _djo_

Yes, though there's also another reason:

c) Safety, being open about the flightpaths of tankers and intelligence-gathering aircraft flying in international airspace near those areas reduces the ability of Russia to claim they weren't informed or that the aircraft strayed into restricted airspace. That means a lower probability of incidents, though it's still not completely safe as demonstrated in 2022: https://www.bbc.com/news/uk-66798508